linux-kernel - Re: [PATCH 01/15] avr32: convert to asm-generic/memory

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Message-ID: <20150926201027.GB27728@infradead.org>
Date:	Sat, 26 Sep 2015 13:10:27 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 01/15] avr32: convert to asm-generic/memory_model.h

On Fri, Sep 25, 2015 at 05:36:36PM -0700, Dan Williams wrote:
> I went to go attempt this, but ia64 is still a holdout, as its
> DISCONTIGMEM setup can't use the generic memory_model definitions.
> 
> #ifdef CONFIG_DISCONTIGMEM
> # define page_to_pfn(page)      ((unsigned long) (page - vmem_map))
> # define pfn_to_page(pfn)       (vmem_map + (pfn))
> #else
> # include <asm-generic/memory_model.h>
> #endif
> #else
> # include <asm-generic/memory_model.h>
> #endif

Seems like we should simply introduce a CONFIG_VMEM_MAP for ia64
to get this started.  Does my memory trick me or did we used to have
vmem_map on other architectures as well but managed to get rid of it
everywhere but on ia64?
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